A378190 Number of planar maps with an external face and n internal triangular faces.

1, 2, 6, 24, 100, 586, 3725, 26532, 198081, 1539550, 12274565, 99959181, 827795678, 6954099320, 59138955508, 508331799502, 4410651891166, 38590663253312, 340173195849485, 3018768835038348, 26952060900042852, 241960993507098580, 2183134755112963493, 19788571100313277286

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Formula

a(n) = (A378337(n) + A378341(n))/2.

Crossrefs

Column sums of A378103.

Cf. A002713, A169808, A377785.

Sequence in context: A141253 A306672 A324063 * A078486 A352364 A129817

Adjacent sequences: A378187 A378188 A378189 * A378191 A378192 A378193

Keyword

nonn

Author

Ya-Ping Lu, Nov 19 2024

Status

approved